Hi ArturoVazquez,
People who perform eDiscovery must be able to view all content that is potentially discoverable. We recommend that you create a security group for eDiscovery users, and add the appropriate users to the security
group. Then you can grant permissions to the security group, instead of to individual users. Choose a name for the security group, and record the name in the worksheet. Also record which users will be members of the security group.
Within SharePoint Online, eDiscovery users must be able to view all content. You should add eDiscovery users as site collection administrators on each site collection that contains discoverable content they
will need to work with. Access to the crawl log needed for items that could not be indexed.
Reference:
http://office.microsoft.com/en-us/sharepoint-server-help/configure-an-ediscovery-center-HA104042284.aspx
Please inform me freely if you have any questions.
Thanks
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Marked as answer by
JasonGuoMicrosoft contingent staff, Moderator
Thursday, September 12, 2013 2:46 PM